Thanks for your question.
The Australian Constitution divides the power to make and manage laws between three largely separate groups. This division is based on the principle of the 'separation of powers'. The three groups that share the power to make and manage federal law are the Parliament, the Executive and the Judiciary (sometimes called the courts).
The principle of the separation of powers prevents any government from having unlimited power, which could potentially be misused. Instead power is shared between the Parliament, the Executive and the Judiciary which provide checks and balances on each other.
For more information you could read our separation of powers fact sheet.